These have extremely hard tungsten carbide spear tips and should be used at low speeds whilst applying light pressure only.For drilling glass windows, mirrors, bottles and ceramics, lubricate with water for best results. Supplied in a...

Glass and tile bit Precision tip- solve bit wander and bit walking High quality carbide with a reinforced head that prevents bit cracking and provides a longer life Flat shank to prevent slippage Use for glass and tile applications 5/16" Carded Material: Metal